No option to disable "smartsense" in synaptics touchpad driver

Step 1:

In the Registry, go to the key HKEY_LOCAL_MACHINE\SOFTWARE\Synaptics\SynTP\Defaults, and set the value of all string entries of the form PalmKms…, to 0. These values determine the amount of ms that the touchpad stays disabled after keyboard input has been detected.

Step 2:

1. Type WIN+R and start "regedit"
2. Confirm that you're an admin (a window may pop up).
3. Navigate to KEY_LOCAL_MACHINE\SOFTWARE\Synaptics\SynTP\Install
4. Change DeleteUserSettingsOnUpgrade from 1 to 0
5. Navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Synaptics\SynTPCpl
6. Change RestoreAllDefaultsfrom 1 to 0
7. Now you can change the ClickPad-Settings (of course, they will not be deleted after a restart, and you can change them as many times as you want to)

Source: How to disable "Smartsense" on Synaptics Touchpad?

After you perform Step 1 and Step 2 you also want to navigate to:

HKEY_CURRENT_USER\SOFTWARE\Synaptics\SynTP\TouchPadPS2_2TM3139 and set PalmRT to 0.

After you completed all the above steps, you will have to restart your machine, in order for the changes to take affect.